title: Effects of age on a new animal model of tardive dyskinesia.
abstract: The effects of age were studied on a new animal model of tardive dyskinesia, i.e., the quantification of oral dyskinesia in rats repeatedly treated with reserpine. Adult and old rats received two injections of reserpine (0.5 or 1.0 mg/kg s.c.) or vehicle, separated by 48 h. One, 10, 25 and 40 days after the second injection of reserpine or vehicle, the animals were observed for quantification of the behavioral parameters of oral dyskinesia: tongue protrusion and vacuous chewing movement frequencies and duration of twitching of the facial musculature. Phenomenologically, control old rats and reserpine-treated adult animals showed very similar oral dyskinesia. When compared to control adult rats, the significant increase in tongue protrusion frequency induced by reserpine treatment was more persistent in the old rats than in the adult animals. Because it is well known that age increases the persistence of tardive dyskinesia, our data provide further support for the validation of reserpine-induced oral dyskinesia as an animal model of tardive dyskinesia. In addition, the possibility is raised that a common pathophysiological mechanism may underlie tardive dyskinesia and age- and reserpine-induced oral dyskinesia.
authors.affiliation: Departamento de Farmacologia, Universidade Federal de São Paulo/Escola Paulista de Medicina, Brazil.
authors.forename: M
authors.initials: M
authors.lastname: Bergamo
authors.forename: V C
authors.initials: VC
authors.lastname: Abílio
authors.forename: C M
authors.initials: CM
authors.lastname: Queiroz
authors.forename: H N
authors.initials: HN
authors.lastname: Barbosa-Júnior
authors.forename: L R
authors.initials: LR
authors.lastname: Abdanur
authors.forename: R
authors.initials: R
authors.lastname: Frussa-Filho
mesh_terms: D000375:Aging / Q000502:physiology*; D000818:Animals; D014150:Antipsychotic Agents / Q000633:toxicity; D001522:Behavior, Animal / Q000187:drug effects; D004195:Disease Models, Animal; D004409:Dyskinesia, Drug-Induced / Q000503:physiopathology*; D008297:Male; D009055:Mouth / Q000502:physiology; D051381:Rats; D017208:Rats, Wistar; D012110:Reserpine / Q000633:toxicity
chemical_list: D014150:Antipsychotic Agents; D012110:Reserpine